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An increase of the airport take-off capacity. The application of the VSA procedure permits the insertion of additional take-offs between landings.
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A reduced flight time thanks to the increase of the global airport capacity.
ATSA VSA eases the application of the VSA procedure in the following terms:
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The flight crew establishes the visual contact with the preceding aircraft in an easier and more reliable way.
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The flight crew is able to clearly identify the preceding aircraft.
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The flight crew anticipates a speed reduction from the preceding aircraft thanks to ATSAW and maintains the visual separation with the preceding aircraft more easily.
In addition, ATSA VSA brings additional benefits to the VSA procedure:
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A reduced probability of wave vortex encounters, as the flight crew is able to better maintain the visual separation.
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A reduced communication workload for the flight crew and the ATC controller, as the visual acquisition of the preceding aircraft is easier.
The use of ATSAW with the VSA procedure is fully described in Appendix
D - ATSAW Visual Separation on Approach (VSA).
3.6.3. ATSAW ENVELOPES AND FILTERING LOGIC
3.6.3.1. ATSAW ENVELOPES
- Vertical extension:
o For ACSS T3CAS: The ATSAW envelopes have the same vertical extension as the TCAS envelopes (refer to Figure 3-5). They depend on the settings of the TCAS control panel (ALL, ABOVE, or BELOW).
o For Honeywell TCAS TPA 100A: The ATSAW envelope goes from – 10 000 ft to + 10 000 ft, regardless of the settings of the TCAS control panel.
- Horizontal range: 100 NM longitudinally, 30 NM on either sides of the aircraft..
3.6.3.2. FILTERING LOGIC
The TCAS computer limits the display of traffic (ADS-B and/or TCAS – refer to
3.6.4.1.1 – TCAS and ATSAW Symbols) that are in the ATSAW envelopes:
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On ND: to the 8 closest aircraft (to avoid clutter)
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On MCDU: to 90 aircraft.
3.6.4. ATSAW INDICATIONS
The ATSAW indications are available on ND and MCDU. The TCAS computer updates the ATSAW indications every second.
3.6.4.1. ND
The ND displays the ATSAW traffic information in ARC and NAV modes. The ND displays the 8 closest aircraft. The ND with ATSAW traffic information is also called the Cockpit Display of Traffic Information (CDTI).
3.6.4.1.1. TCAS and ATSAW Symbols
On ND, the TCAS computer capable of ATSAW displays three types of traffic symbols:
- TCAS Only: The traffic does not transmit ADS-B data. The TCAS computer identifies the traffic with TCAS data only.
- ADS-B Only: The traffic transmits ADS-B data and is out of TCAS range. The TCAS computer identifies the traffic with ADS-B data only.
- TCAS+ADS-B: The traffic transmits ADS-B data and is in TCAS range. The TCAS computer identifies the traffic with both TCAS and ADS-B data. Refer to
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